I absolutely love these types of perspective pieces on newgrounds. It's a great contrast to the number of flat pop-arty piece (which I love just as much, but variety is the spice of life)
For your piece specifically, I just cant stop looking at the tatoos. And then I get that embarassment because she is staring me down like I am daft for looking at them. Very nice.
One piece of criticism -- D: -- is that I believe the background because of its meshy, washy nature. But the bike kind of looks silly being in that style while still being a foreground element. Maybe if it transitioned, or something.. I don't know. I don't think it needs to be changed any, it looks lovely as it is. I just don't believe it is really there if I focus on it. If I focus on what I am supposed to though -- the girl -- then it fits perfectly. I don't know if that is helpful, but that's what you get.